Question: Tell me time whose name has the word  prehistory in it.
Paraphrase: Let me know time whose title has the word ancient times in it.
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q11471 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'prehistory')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: prehistory, prehistory